Lead pencil



May 20 1924.

A. POLLAK LEAD PENCIL Original Filed Feb. 9 1922 fnl/111111111111111.

Suva/nto@ B/M HAM PaLiA/f. HI

Patented May 20, 1,924.

POLLAK, F NEW YORK, N1 Y.,

PATENT QFFICE.

ASSIGNOB TO SAMUEL 0F NEW vonx. N. Y.

Lmn Praten..

t I i Original application ied February 9, 1922, Serial No. 535,273.Divided and this application led January 2, 1923.

To all -fwhom it may concern.:

Be it known that I, ABRAHAM Ponmx, ,a citizen of the United States, anda resident of New York city, in the county of New York and State of NewYorkhave invented certain new and useful .Improvements in P@LeadPencils, of which the following is a specification. f

V Theinvention relates to improvements in mechanical lead pencils, andit consists in the novel features, structure and .combinations of partshereinafter described, and particularly pointed out in the claims.

This application is a division of my application filed February 9, 1922,Serial No.

My invention pertains more particularly to a lead pencil containing achamber for reserve leads and having means for propelling its lead'forwardly for writing purposes, the chamber being of rotary tubecharacter and its outer end being normally closed by a' plug rubbereraser, and my inveiition resides in a novel slidable cap or headapplied to the outer endof the pencil normally con cealingthe rubbereraser and adapted when pulled outwardly to be turned laterally forexposing said eraser. said cap or head havling a slidable and also apivotal connection by means offside arms with said rotary tube andserving as means for rotating said tube for -propelling the writinglead, and said side arms in the normal condition of the pencily beingconcealed between said rotary tube and the exterior casing of thepencil, so that y only the cap or head proper, which is of ornamentalcharacter,-is exposed.

The invention will be fully understood from the detailed descriptionhereinafter presented, reference being had to the accompan g drawings,in which:

Fig. is a longitudinal section through a lead pencil equipped withfeatures constituting the' present invention; .f

Fig. 2 is a side elevation, partl in section, of the outer end portionof t e pencil and illustrates the closing ca ashaving been drawnoutwardl to the'full extent permitted by its pivot'a arms preparatory'to the cap being turned laterally to expose the rubber eraser carriedby the interior rotary tubular member of the pencil, said tubular penciltaken on Serial No. 610,092.

'portion of the pencil and illustrates the cap of Fig. 2 as having beenturned downwardly to expose the rubber eraser;

Fig. 4 is a vertical section through the the dotted line 1 -4 of Fig. 1,and

Figs. 5, 6 and 7 show the respective parts ofthe lead-holding andactuat' mechanism finally disposed centrally wlthin the pencll.

The pencil presented herein is the pencil shown 1n my aforesaidapplication and the subject matter of this appllcation resides in thecap or head construction at the outer end of the pencil, such subjectmatter being aseparate invention from the other portions of the pencilclaimed in said application and not necessarily limited thereto orconfined to use therewith.

The general featuresl of the pencil will therefore be briefly referredto and the construc-tion made the subject hereof will be specificallydescribed.

The pencil comprises four main tubular members 10, 11, 12 and 13, themember 13 being polygonal in cross-section and rigid with the member 11and carried thereby.

The member 10 constitutes the exterior shell or casing of the. penciland has a for-` ward tip-member 14 for the forward end of the lead 15.

The rear end of the casing member 10 is normally closed by a c ap 16whose details will be hereinafter described and which, by means of ayoke 17, is pivoted to the tubular member 12, said member 12 havingslots or elongated openings 18 in its opposite sides to receive theforwardly bent ends 19 of the yside arms 119 of said yoke and permitsaid -yoke with the cap 16, to have a longitudinal movement when pressedtowardvthe rear end of the casing 10 or to the position shown in Fig. 1or 'drawn outwardly therefrom, as shown Fig. 2, preparatory to beingswung downwardly to the position shown in Fig. 3 .to expose the eraser20 which plugs the rear end of the tubular member 12.

The tubular member 12. is a plain cylindrical barrel having theopenings18 near tubular member 13, as shown in Fig. 1. The

its rear end and at its front end being secured in an annular recess 21formed on the rear end of a nut 22 which contains a spirally threadedhole 23 in line with the longit-udinal center of the tube 12 and ahollow central portion 24 constituting a recess to freely receive therear end of the nut 22 has rounded forward edges 25 and an annularrounded groove 26. The threaded hole 23 in the nut 22 cooperates withthe longitudinall movable spiral rod 27, as hereinafter escribed, andthe forward end of the nut 22 enters and interlocks with the rear end ofthe tubular member 11, said member 11 at its rear end being slit to formspring members adapted to pass upon the nut 22 and then spring inwardlyinto the recess 26 thereof. In the assembly of the parts the nut may beforced into the rear end of the tubular member 11 and when therein saidnut serves to connect the tubular members 11, 12 togetherand permit themember 12 to have free rotary movement and to rotate said nut, while themember 11 remains stationary with the outer casing 10.

The tubular member 12 is therefore rotatable within the outer shell orcasing 10 and carries the nut 22, cap 16 and eraser 20, and said member12 forms within it a 'chamber for reserve leads, said chamber beingaccessible when the eraser 20 is withdrawn from the tube and closed whensaid eraser is returned to position.

The tubular member 11 is, at its forward portion, of reduced diameter,being offset inwardly, as at 129, and continued forwardly, as at 30, andsaid portion 30 forming a concentric tube which projects, into the tip14 of the casing 10. The'offset portion 129 of the tube 11 engages therear end of the tapered portion or tip 14 of the casing 10, and the tube11 has a firm friction-lit within the casing 10.

The tubular member 13 is concentrically within the tube 11 and itsmember 30, and at'its rear end said tube 13 freely Aenters the recess 24of the nut 22, while at its forward portion said tube 13 fits closelyWithinthe auxiliary tube 30 and projects forwardly beyond the same andis turned inwardly at its forward extremity to form an annular flange31. The tubular member 13 is polygonal in cross-section and rigidly heldwithinthe auxiliary portion 30 of the tube 11, whereby the tubularmembers 11, 13 become a vunit and are stationary within the outer casing10. K

The operative mechanism occupying a central v longitudinal positionwithin their,

\ pencil and by means .of which the lead is propelled forwardly orretracted rearwardly on the rotation in one direction or the other ofthe tube 12, is shown detached in Figs. 5,

"6 and 7 and consists of a spirally threaded rod or screw 27 having onits forward end a polygonal head 33 containing a threaded recess 34, apropeller rod 35 threaded on its rear end to be screwed into said recess34 and having on its forward end a head 0r Section 36 of somewhatgreater diameter than thebody of the rod 35, a coiled spring 37coninedon the rod 35, and a tubular lead-clutch or member 38 having apolygonal head 39 and slit sides 40 to grasp the lead 15. The head 39has a hole 41 in it, and in the assembly of the parts the rod 35 is,starting at its rear end, inserted into the clutch member 38 from theforward end thereof and through the hole 41, and then the spring 37 isplaced upon the rod 35 and compressed to some extent thereon, wher uponthe threaded rear end of the rod 35 is screwed into the recess 34 of thehead`33 on the rod or screw 27, the spring 37 then being confinedbetween said head 39 and said head 33. The head 36 on the rod 35 isadapted to have longitudinal movement within the clutch member 38 and atits forward end engages the lead 15.

The polygonal head 33 on the rod or screw 27 and the polygonal head 39on the clutch member 38 conform to'the interior cross-section of thepolygonal tube 13, and the forward edge of the head 39 is normallypressed against the stop ange 31V on the end of said tube 13 by thespring 37. The heads 33, 39 are prevented from rotating/within the tube13 by reason of the polygonal cross-section of said heads and/tube, andhence the screw or rod 27, rod 35 and clutch member 38 can have norotary motion. The heads 33, 39 may, however, have longitudinal slidingmovement within the tube 13. The means forpropelling the heads 33, 39and with them the rod 35 andclutch member 38, forwardly to exposeorwholly eject the lead 15 and for retracting said heads, rod and clutchmember ltowithdraw the lead into the pencil, consist of the rotary tube12, nut 22 and rod or screw 27, said rod or screw moving forwardly whenthe said tube and nut are turned in one direction and rearwardly whensaid tube and nut are turned or rotated in the reverse direction. Theclutch member 38, rod 35 and screw 27 move forward with substantialuniformity until the head 39 meets the stop {iange 31, and during thismovement the head 36 on the rod 35 exerts .a yielding pressure on thelead due to thepresence of the spring 37 After a lead has become undulyshort and it 1s desired to expel the Same from the pencil, the tube 12and nut 22 are turned 't'o propel 'the rod 35 and clutch member 38forwardly 53 engaging diagonally opposite edges through the clutchmember 38 and against the piece of lead 15 until said piece has beenexpelled.

The rotation of the tubular member 12 and nut 22 to cause the travelingmovement of the rod or screw 27 and its connected parts, is effected byholding the main casing 10 stationary and turning, with the thumb andlinger, the cap 16 when said. ca is in its operative position at therear end of said.casing, as `s own in Fig. 1.

- The cap 16 and yoke 17 are of special construction and a ent. The yoke17 consists of two sidearms 119 whose forward ends 19 freel enter theslots 18 of the tube 12 and a 'sk head 50 which connects the rear endsof said arms and is confined within the cap 16. The cap 16 has anenlarged outer end affording an ornamental finish for the cil, anornamental bead 51 at its inner e to engage the rear edge of the maincasing 10 and Ilain sides 52 having indented lugs 53 which perform twofunctions, one being to prevent the escape of the cap from the yoke 17,while at the same time permitting the cap to be slid inwardly on saidyoke and the rear end of the tube 12 to the position shown in Fig. 1 andoutwardly from said tube 12 and partly from of the yoke 17 to theposition shown in Fig. 2, after which the cap and yoke may be turneddownwardly, as shown in Fig. 3. clear of the eraser 20. The cap 16provides a chamber for the outer portion of the eraser 20, and when thecap and yoke are turned to a horizontal position while extended. in thedirection from each other (Fig. 2), the cap may he pushed forwardly onthe yoke 17 and tube 12 land will push the yoke forwardly until the bentend portions 19 of the yoke slide to the forward ends of the slots 18and pa below the outer edges of the main casing 10, the whole thentaking the position shGown in Fig. 1. When the cap 16 is in the tionshown in 1, it will be u as a key for rotating the tube 12, and at thistime the indented lugs 53 will perform their second function, to-wit,that of engaging the arms 119 and throughsaid arms` imparting to rotarymovement of said cap to the tube 12 for actuating the screw 27 and partsassociated therewith, said lug;

o said arms when the cap 16 is tumad clock wi and the other diagonallyopposite edges of said arms when the cap is turned counterclockwise. Thecap 16 and yoke 17 thus serve as means for turning the tube 12 in eitherdirection and the cap 16 serves as a finish for the rear end of thepencil and also affords a chamber concealing the eraser 20. The cap 16Lis pulled outwardly and then downwardly (Fig. 3) when theeraser20istobeusedorvhantbeeraser is to be detached for explosing thereverselead chamber in the tube 12.

When the screw 27, rod 35, spr' 37 and clutchmember 38 have been assemled as described, the screw 27 may be screwed into and through the nut22 to the requisite extent and thereupon the clutch member 38, rod 35,spring 37, head 33 and forward end of the screw 27 will be movedforwardly into the hexagonal or lygonaltube 13 and the forward end of tenut 22 will be forced into the rear end of the tube 11, thus assemblingall the interior parts of the pencil quiclklyV and into unit form. Theexterior casing 10 will then be pushed in a rearward direction over saidassembled interior parts, be applied and the cap 16 and yoke 17 will beturned upwardly and then pushed forwardly on the tube 12 and to theiroperative position shown in Fig. 1.

What I claim as my invention and'desire to secure by Letters Patent, is

1. A mechanical lead pencil comprising an exterior casing containing arear rotary tube from which the lead propelling mechanism is` operable,said tube affording a chamber closed at its rear end vby a plug, andmeans for manually rotating said tube comprising a hollow head and ayoke connected therewith and pivotally connected with said-tube, saidhead being slidable on said yoke and adapted to be drawn outwardlythereon and then turned downwardly therewith to expose the plug.

2. A mechanical lead pencil comprising an exterior casing ntaining arear rotary tube projecting at its rear end beyond said casing andaffording a lead holding chamber closed at its rear end by a plug andfrom which tube the lead propelling mechanism is operable, and means formanually rotating said tube comprising a hollow head adapted to lit uponsaid tube and pass into abutting relation to the end of said casingI anda yoke and-finally the eraser 20 will comprising connected side-armspivotied to said tube and on which said head is slidably mounted so asto be drawn rearwardly from olf lsaid tube and turned downwardly withsaid arms.

3. A mechanical lead pencil comprising an exterior casing containing arear rotary tube projecting at its rear end beyond said casing andafording a lead holding chamber closed atits rear end by a plug and fromwhich tube the lead propelling mechanism is operable, and means formanually rotating said tube comprising a hollow head adapted to fit uponsaid tube and pass into abutting relation to the end of said and a yokecomprising connected side-arms pivoted to said tube and on which saidhead is slidably mounted so as to be drawn rear-A wardly from off saidtube and ttned downwardly with said arms, said ead being isa equipped atopposite sides with inwardly projecting lugs to engage said arms at d1-agonally opposite edges thereof when said head is rot-ated for lmpartingrotary motion to said tube.

4:. A mechanical lead pencil comprising an exterior casing containing arear rotary tube projecting at its rear end' beyond said casing andaffording a lead holdin chamber closed at its rear end by a p ug andfrom which tube the lead propelling mechanism is operable, and means formanually rotating said tube comprising a hollow head adapted to fit uponsaid tube and pass into abutting relation to the end of sald casing anda yoke comprising connected side-arms pivoted to said tube and on whichsaid head is slidably mounted so as to be drawn rearwardly from oil saidtube andturned down-- wardly with said arms, the means securing saidside arms to said tube being elongated openings in said tube andextending outwardly from below the end of said cas-ing rand inwardlyextended forward ends on Said arms projected through said openings andslidable longitudinally therein, whereby when said head and arms arepressed forwardly toclosed position, the forward portions oi" said armspass within said outer casing and have a snug engagement therewith.

5. A mechanical lead pencil comprising `an exterior casing containing arear rotary tube projecting at its rear end beyond said casing andaording a' lead/holding chamber closed at its rear end by a plug andfrom which tubejthe lead propelling mechanism is operable, and means formanually rotatin sald tube comprising a hollow head adapted to fit uponsaid tube and means associated with Said head and pivotally connectedwith said tube and adapted to communicate the rota motion of said headto said tube and a so to permit said head to be slid outwardly from saidtube and turned downwardly, said head being adapt ed to pass intoabutting relation to said cas ing and conceal said rotary tube and alsothe means connecting the head therewith.

6. mechanical lead pencil `comprising an exterior casing, a rear rotarytube therein projecting rearwardly beyond said casing and from which thelead propelling mechanism is actuated, a plug closing the outer end ofsaid tube, and means for manually rotating said tube comprising a hollowhead adapted to lit upon and conceal the projecting end of said tube andpass into abutting relation to the end of said casing, a yoke havingconnected side arms extending from within said head and pivotallyconnected with said tube and upon which said head is slidable and meansfor imparting rotary motion of said head to said arms and therethroughto said tube, said arms in the normal condition of the pencil beingconcealed.y l

7. A mechanical lead pencil comprising an exterior casing, a rear tubetherein and spaced therefrom and projecting rearwardly ybeyond saidcasing, a plug closing the outer end of said tube, a hollow head fittingupon and concealing the projecting end of said tube and engaging the endof said casing andl yoke arms connecting said head with',

Said tube, said tube being slotted to pivotally recelve the inner endsof said arms and permit sliding movement of the arms when said head isdrawn rearwardly ofi' from and returned to said tube, said head beingslidable on said arms and the saidy arms in the normal condition of thepencil being concealed in part within said head and in part within thespace between said casing and said tube. n

Sbilgned at New York city. in the countyl of ew York and State of NewYork, this 11th day of December A. D. 1922.

ABRAHAM POLLAK.

